The plane maker’s stock was one of the standouts as the Standard & Poor’s 500 index rose for an eighth straight day, its longest streak of gains since January.

Boeing gained $3.79, or 3.7 percent, to $105.66 after it was found that batteries were not the cause of a fire on one of its 787 aircraft at London’s Heathrow airport Friday. Earlier this year, smoldering batteries on two 787s caused the plane to be grounded for three months.

The gains continued a hot streak for the market this month.

The Dow Jones industrial average rose 19.96 points, or 0.1 percent, to close at 15,484.26.

The Standard & Poor’s 500 index rose 2.31 points, also 0.1 percent, to 1,682.50. The S&P is up 4.8 percent so far in July, putting it on track to surpass the 5 percent gain it had in January. Both the Dow and S&P are at all-time highs.